黄龙病是严重危害华南柑桔的病毒病害。近年来有些地区由于它的流行,严重影响柑桔的增产和发展。如潮汕地区的潮安、潮阳两个柑桔生产县,去年有许多二年至三年生蕉柑园发病率达20—30%,有的超过40%。全区柑桔产量比1972年减少46.3%,就是高水平管理的澄海县卫东大队柑桔园,发病率也达11.1%。因此,如何有效地控制黄龙病是当前生产上一个急待解决的问题。黄龙病能否控制和如何控制,是一个有争论的问题。笔者在潮汕从事柑桔工作二十一年,工作岗位由生产部门到试验研究机关,又回到生产部门。遵照毛主席“实践、认识,再实践、再认识”的伟大教导, Huanglongbing is a serious damage to southern China citrus virus disease. In some areas in recent years, its popularity has severely affected the increase of citrus production and development. For example, there are two citrus producing counties in Chaoshan and Chaoyang in the Chaozhou-Shantou region. In the past year, many cases of banana citrus groves had a rate of 20-30% and some 40% or more in two to three years. The region’s citrus production decreased 46.3% over 1972, is the high level of management Chenghai County, Weidong Brigade citrus garden, the incidence rate reached 11.1%. Therefore, how to effectively control Huanglongbing is an urgent problem in current production. It is a controversial issue whether or not Huanglongbing can be controlled and how to control it. I work in citrus in Chaoshan for twenty-one years, from the production department to the experimental research institutes, back to the production sector. Following Chairman Mao’s great teaching of “practice, knowledge, practice and re-understanding”